“The way Codebreaker worked was simple: Somebody would watch an in-game live feed and log the catcher’s signs into the spreadsheet, as well as the type of pitch that was actually thrown. With that information, Codebreaker determined how the signs corresponded with different pitches. Once decoded, that information would be communicated through intermediaries to a baserunner, who would relay them to the hitter.”

“But everything started with Codebreaker, and the use of it to steal signs continued into 2018—not just at home, but also on the road.”